EFFECT OF Telenomus remus NIXON (HYMENOPTERA: SCELIONIDAE) DENSITY ON CONTROL OF Spodoptera frugiperda (SMITH) (LEPIDOPTERA: NOCTUIDAE) EGG MASSES UPON RELEASE IN A MAIZE FIELD

Authors

  • MARIA DE LOURDES CORRÊA FIGUEIREDO
  • TEREZINHA MARIA CASTRO DELLA LUCIA
  • IVAN CRUZ

DOI:

https://doi.org/10.18512/1980-6477/rbms.v1n02p%25p

Keywords:

Insecta, lagarta-do-cartucho, praga de milho

Abstract

The impact of releasing different densities (0, 6, 9 and 12 adult females m-2) of the egg parasitoid Telenomus remus Nixon on maize plants artificially infested with Spodoptera frugiperda (Smith) egg masses (one m-2) was evaluated. Egg masses were pinned in the midrib of the plant 36 days after planting. One egg mass contained approximately 65 eggs. The experimental design was in a randomized complete block design with five replications (16 m2 plots). There was a significant effect on percentage of parasitism egg masses. The highest parasitism values were verified in plots where 9 or 12 females of T. remus m-2 were released, respectively, 74 and 88.3 %. The relationship between percentage of parasitized egg masses and parasitoid densities was quadratic (Y = 16.8 + 9.98 X – 0.35 X2, r2 = 0.99). The natural occurrence of Trichogramma spp. was relatively constant over the egg masses fixed on maize plants (52.5%). However, the average T. remus parasitism on the eggs of a mass was much higher, representing 80.4% while the parasitism was only 21.3% in the case of Trichogramma. The presence of both parasitoids was responsible for up to 97.5% of parasitism, obtained from plots with a released density of 12 T. remus female m-2.

Published

2010-04-07

How to Cite

FIGUEIREDO, M. D. L. C., DELLA LUCIA, T. M. C., & CRUZ, I. (2010). EFFECT OF Telenomus remus NIXON (HYMENOPTERA: SCELIONIDAE) DENSITY ON CONTROL OF Spodoptera frugiperda (SMITH) (LEPIDOPTERA: NOCTUIDAE) EGG MASSES UPON RELEASE IN A MAIZE FIELD. REVISTA BRASILEIRA DE MILHO E SORGO, 1(02). https://doi.org/10.18512/1980-6477/rbms.v1n02p%p

Issue

Section

Scientific Paper

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